With the help of Jeff and the study group, Annie faces off against a new rival in a model UN showdown. Meanwhile, newly appointed security guard Chang must deal with Britta, who has returned to her activist ways.

When Britta discovers that an anonymous personality test suggests that one of them is a homicidal maniac, she convinces each of the study group members to tell a scary story in order to determine who the possible killer is.

Pierce discovers that Hawthorne Wipes have become popular in the gay community and launches a new product to capitalize on it. Meanwhile, Troy is offered entry into the secret society of air conditioning repair.

After the Greendale Glee Club is sidelined, Abed falls under the influence of its musical director Cory "Mr.Rad" Radisson and gradually recruits the other members of the study group to replace them in the upcoming the Holiday Musical.

Andre re-proposes to Shirley and Britta and Annie quickly begin making arrangements for the wedding. Jeff must write a speech, and Troy and Abed attempt to become "normal" for the wedding. Pierce and Shirley try to get a sandwich shop installed in the cafeteria.

Annie, Troy, and Abed try to help Britta avoid an old flame who has returned to town while Jeff and Shirley set out to catch a glimpse of the mystery man. Elsewhere, Laybourne turns to Dean Pelton for help with his pursuit of Troy.

Annie and Abed spend some quality time together in the Dreamatorium for a simulation of "Inspector Spacetime." The exercise takes a turn toward the serious, however, with examinations of the study group and insight into Abed's personality.

In an homage to "Law & Order'", the study group investigates a crime when someone sabotages their Biology lab experiment. When they discover the perp, Annie plans on prosecuting them to the fullest extent of Greendale's Code of Conduct.

After the study group's expulsion from school, Abed becomes convinced that Dean Pelton is an impostor. When he is caught on the Greendale campus investigating him, he is forced to receive psychiatric treatment from Dr. Heidi or face trespassing charges.

Pierce and the study group pay a visit to Hawthorne Enterprises after Pierce is summoned to discuss his inheritance with his deceased father's former right-hand man, Gilbert Lawson. The study group goes with him for moral support and must all pitch in to play the video game of their life on Pierce's behalf - or risk losing his inheritance.

The study group mobilizes to save Greendale and rescue a captive Dean Pelton from Chang who, along with his security force, has taken over the school. Meanwhile, Troy turns to the Air Conditioning Repair Annex to get assistance for their plans.

'Shirley and Pierce have a disagreement over their sandwich shop leading to a showdown between their lawyers Jeff and his former colleague Alan Connor in the "Greendale Summer Fun Court". Meanwhile, Vice Dean Laybourne tells Troy about his destiny at the Air Conditioning Repair Annex.